/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 *  kernel/mqueue/mq_msgqalloc.c
 *
 *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <mqueue.h>
#include <assert.h>

#include <tinyara/kmalloc.h>
#include <tinyara/sched.h>
#include <tinyara/mqueue.h>

#include "sched/sched.h"
#include "mqueue/mqueue.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Type Declarations
 ****************************************************************************/

/****************************************************************************
 * Public Variables
 ****************************************************************************/

/****************************************************************************
 * Private Variables
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: mq_msgqalloc
 *
 * Description:
 *   This function implements a part of the POSIX message queue open logic.
 *   It allocates and initializes a struct mqueue_inode_s structure.
 *
 * Parameters:
 *   mode   - mode_t value is ignored
 *   attr   - The mq_maxmsg attribute is used at the time that the message
 *            queue is created to determine the maximum number of
 *            messages that may be placed in the message queue.
 *
 * Return Value:
 *   The allocated and initialized message queue structure or NULL in the
 *   event of a failure.
 *
 ****************************************************************************/

FAR struct mqueue_inode_s *mq_msgqalloc(mode_t mode, FAR struct mq_attr *attr)
{
	FAR struct mqueue_inode_s *msgq;

	/* Check if the caller is attempting to allocate a message for messages
	 * larger than the configured maximum message size.
	 */

	DEBUGASSERT(!attr || attr->mq_msgsize <= MQ_MAX_BYTES);
	if (attr && attr->mq_msgsize > MQ_MAX_BYTES) {
		return NULL;
	}

	/* Allocate memory for the new message queue. */

	msgq = (FAR struct mqueue_inode_s *)kmm_zalloc(sizeof(struct mqueue_inode_s));

	if (msgq) {
		/* Initialize the new named message queue */

		sq_init(&msgq->msglist);
		if (attr) {
			msgq->maxmsgs    = attr->mq_maxmsg;
			msgq->maxmsgsize = attr->mq_msgsize;
		} else {
			msgq->maxmsgs    = MQ_MAX_MSGS;
			msgq->maxmsgsize = MQ_MAX_BYTES;
		}

#ifndef CONFIG_DISABLE_SIGNALS
		msgq->ntpid = INVALID_PROCESS_ID;
#endif
	}

	return msgq;
}
